Electrical Systems / Energy Management

Atlas Copco's ZS range of energy-saving screw blowers meet today's low-carbon economy requirements

Source: PlantServices.com

Mar 30, 2010

Atlas Copco announces its new energy-efficient technology for air blowing applications — the ZS screw blower. Screw technology on average is 30% more energy efficient compared to lobe technology. Atlas Copco is convinced that the lobe technology, widely used at present, no longer meets the needs of today’s low carbon economy. The ZS screw blower will replace the company’s entire range of ‘Roots’ type rotary lobe blowers.

Stephan Kuhn, President of Atlas Copco’s Compressor Technique business area, says:

“Atlas Copco continuously innovates to ensure sustainable productivity for our customers. They will greatly benefit from the average 30% energy savings achieved from our leading-edge screw technology compared to conventional lobe type blowers. Atlas Copco customers are able to take advantage of tomorrow’s blower technology today."

According to the United States Environmental Protection Agency (EPA), for example, “…approximately 56 billion kilowatt hours (kWh) is used for drinking water and wastewater services. Assuming an average mix of energy sources in the country, this equates to adding almost 45 million tons of greenhouse gases to the atmosphere. Just 10% of energy savings in this sector could collectively save about $400 million annually.”

In a typical biological wastewater treatment plant, the aeration blower system accounts for up to 70% of the energy usage. Today the majority of these plants use less efficient lobe technology, a technology that has had little development since its introduction in the late 19th century. By reducing the energy usage of their aeration blower system, these plants will decrease their energy costs while operating in a more environmentally friendly manner.

Chris Lybaert, President of Atlas Copco’s Oil-free Air Division adds:

“Energy consumption typically represents 80% of the lifecycle costs of a blower. By introducing screw technology to our air blower range, we now offer a complete product portfolio of compressors and blowers for all applications and processes below 4 bar(e)/58 psig. Atlas Copco’s screw technology helps customers to save energy, which is a major advantage in a highly competitive marketplace.”

Many industries use air blowers for their processes and will benefit from the energy efficiency of screw air blowers. Those that will have a major benefit are the municipal and industrial wastewater treatment plants, where air blowers typically represent up to 70% of the total electricity costs. Here, millions of bacteria feed on organic waste, breaking it up into carbon dioxide, nitrogen gas and water. Because the bacteria need oxygen, large amounts of air are blown in the aeration tanks.

The performance of the new ZS screw blower was tested against a tri-lobe blower by the independent Technische Überwachungs-Verein (German Technical Monitoring Association, or TÜV), according to the international standard ISO 1217, edition4. It was proven that the ZS is 23.8% more energy-efficient than a tri-lobe blower at 0,5 bar(e)/7 psig, and 39.7% at 0,9 bar(e)/13 psig. The world-class efficiency of the ZS is mainly attributed to the superior screw technology. Other important features that secure increased efficiency and reliability are the integrated gearbox, the oil system and the innovative design that integrates all individual components into a plug-and-run solution.